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A066791
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a(n) = phi(n^2 + n + 1).
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1
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2, 6, 12, 12, 30, 42, 36, 72, 72, 72, 108, 156, 120, 210, 240, 144, 306, 294, 252, 420, 462, 312, 468, 600, 360, 648, 756, 540, 792, 756, 660, 900, 1122, 792, 1152, 1260, 792, 1482, 1332, 1092, 1722, 1656, 1260, 1692, 1944, 1224, 2160, 2160, 1512, 2550
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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PROG
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(PARI) { for (n=1, 1000, write("b066791.txt", n, " ", eulerphi(n^2 + n + 1)) ) } \\ Harry J. Smith, Mar 27 2010
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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